Advertisements
Advertisements
प्रश्न
Which of the following statements are correct?
- Sound is produced by vibrations.
- Sound requires a medium for propagation.
- Light and sound both require a medium for propagation.
- Sound travels slower than light.
पर्याय
i & ii only
i, ii & iii only
ii, iii & iv only
i, ii & iv only
Advertisements
उत्तर
i, ii & iv only
Explanation:
Because light can travel in vacuum also but it is only sound that requires a medium to travel.
APPEARS IN
संबंधित प्रश्न
How are the wavelength and frequency of a sound wave related to its speed?
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting :
Answer the following question :
Can sound travel in vacuum?
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Give a scientific reason.
If you were both on the moon, your friend will not be able to hear you call.
What is approximate value of the speed of sound in iron as compared to that in air? Illustrate your answer with a simple experiment.
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
What is a wave?
